and political figures. the plane was on its way to a ceremony in russia to mark the 70th anniversary of the soviet killing thousands of polish prisoners of war. when it crashed in thick fog with 96 people on board, there were all sorts of conspiracy theories swirling around. it has emerged that there were some serious mistakes made in the way the russians identified the bodies. forensic tests have shown that several people were buried in the long rates, and now more bodies are being exhumed to check their identities. >> the college president was killed with 95 others in a plane crash in russia in 2010, but in a macabre scandal, poland is still burying the dead after authorities say six bodies were misidentified and buried in the wrong graves. the first hint something was amiss was the discovery of irregularities in forensic documents sent from russia. poland's military prosecutors said they had reason to believe that the body of the country's last president in exile was not the one buried in the temple of divine providence in warsaw. he served his time while the country was still rul

. canada, denmark, norway, russia are among the countries competing for the resources. we accompanied a danish icebreaker on its journey to the north pole. the expedition includes scientists who are hoping to find evidence to support their claim to the region. >> in august, some sunshine and clouds revealed the full might of mother nature in a special way. the conditions nature creates are likely to be the biggest challenge for 45 researchers on board the icebreaker. the danish government has commissioned the geologists' to find out if a seabed in as part of the arctic is part of greenland's landmass and therefore belongs to the kingdom of denmark. christian leads the expedition. in his homeland, he is one of the most experienced specialists in his field. >> we want to get to the north pole because if our hypothesis is correct, then that area belongs to us because one of the largest submarine mountain ranges belongs to us. we are looking for evidence to claim a larger area. all the way over to russia. >> the rich extends northward across the sea floor from greenland and the north pole

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